Final answer:
The probability that it will rain on Monday is 30%.
Step-by-step explanation:
The probability that it will rain on Monday can be determined by the percentage given by the meteorologist. In this case, the meteorologist says there is a 30% chance of rain on Monday. This means that out of 100 days with similar weather conditions, it is expected to rain on 30 of those days. Therefore, the probability that it will rain on Monday is 30%.